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# Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

1. ### Sticky: We only provide homework help to those who show effort

Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

• Replies: 0
• Views: 31,080
09-30-2005, 09:44 AM
1. ### Basketball shooting percentage - binomial distribution?

I am interested in studying the probability of team field goal percentage being unusually high. In context, I recently watched a women's college...

• Replies: 3
• Views: 2,559
02-15-2015, 11:59 AM
2. ### Negativ Binomial distribution

I am trying to count number of occurrence for variable X. I have considered X as Poisson distributed since this sounds like a Poisson process. But...

• Replies: 2
• Views: 2,183
02-15-2015, 06:15 AM
3. ### Type of Discrete Distribution

What type of discrete probability distribution is the probabilities of the sum of the outcomes of an infinite number of dice rolls? The probabilities...

• Replies: 2
• Views: 1,842
02-15-2015, 06:05 AM
4. ### difference of two independent Poisson random variables

Why the difference of two independent Poisson random variables doesn't have Poisson distribution? Demonstrate it.

• Replies: 6
• Views: 4,473
02-13-2015, 11:50 AM
5. ### Bernoulli distribution and PGF

let Yi,j be independent Bernoulli random variables with E = 1/j. Let Zj = sumYi,j for i=1 to j . Let MZj(s) be the probability generating function...

• Replies: 6
• Views: 2,478
02-12-2015, 01:37 PM
6. ### Exponential Distribution with uniform random variables

I choose Θ according to the exponential distribution with mean 1. I then choose 10 i.i.d. random variables X1, . . . , X10, where each Xi has...

• Replies: 2
• Views: 2,123
BGM
02-11-2015, 11:42 PM
7. ### Combinations question

I have a strange question I hope someone can explain it to me or tell me if there is some type of statistical definition for this process im trying...

• Replies: 6
• Views: 1,694
02-10-2015, 10:09 PM
8. ### Error in Mosteller book? Problem 37

I have been reading this book since I was 13. Time to time I open it and solve one or two problems (if I can). Especially I like problem #37 about a...

• Replies: 4
• Views: 1,505
02-09-2015, 05:14 PM
9. ### Probability of Sporting Event Occurring

Hello everyone I am trying to establish whether it is possible (or appropriate) to calculate the probability of a sporting event occurring given...

• Replies: 0
• Views: 2,961
02-09-2015, 02:29 PM
10. ### Var(X+Y+Z)

What is the formula for the variance of 3 dependent variables? For 2 dependent variables, the formula is Var(X)+Var(Y)+2*Cov(X,Y) What is...

• Replies: 6
• Views: 69,949
02-09-2015, 02:15 AM
11. ### I need a lot of help!

Hi guys. I have some questions and I will really appreciate your help! <3 1. (c) “Whenever possible, open-ended classes should be avoided.”...

• Replies: 0
• Views: 3,661
02-08-2015, 01:47 AM
12. ### Combinatorial Analysis HW Help

There are 100 U.S Senators, two from each of the 50 States. If 12 Senators are randomly chosen to form a committee, what is the probabilty that...

• Replies: 0
• Views: 1,656
02-08-2015, 12:36 AM
13. ### Probability

A hiker is lost in a cave, and he wants to get out of the cave. Three passages are open to her. The first passage leads to the outside after 1 hour...

• Replies: 3
• Views: 2,423
02-06-2015, 01:06 PM
14. ### I need your help!

(a) Bottle 1 consists of 4 red balls and 6 blue balls. Bottle 2 consists of some unknown number of red balls and 12 blue balls. One ball is drawn...

• Replies: 1
• Views: 1,757
02-06-2015, 08:11 AM
15. ### Stuck with a (i think) simple problem

Hi everybody, I have a question here that I'm completely brain frozen with.. (I'm not the youngest anymore, and I can't seem to wrap my brain around...

• Replies: 5
• Views: 1,967
02-05-2015, 01:39 PM
16. ### Probability of Failure of components...

Hi there, My question is pretty simple, but I think I am going about the wrong way. An aircraft part has a .40 probability of being...

• Replies: 1
• Views: 956
BGM
02-05-2015, 12:40 AM
17. ### Calculating Sensitivity and Specificity of Combined Testing...With a Surprise.

Ok guys. I have an interesting question. I'm a biomedical engineering student from Georgia Tech and for one of my classes I have to implement...

• Replies: 5
• Views: 1,649
02-03-2015, 09:35 AM
18. ### Problem regarding expectation, cdf

There are two random variables X1, X2 that are iid and continuous. Their cdf is F(x)= P(Xi<x). Show P(X1<X2) = E(F(X1)) Show that E(F(X1)) = 1/2....

• Replies: 3
• Views: 1,407
BGM
02-01-2015, 03:16 PM
19. ### Simple Probability

Years since I have done stats, just want to check I have done this correct: If amazon use 3 companies to deliver parcels, Royal Mail, City Link,...

• Replies: 2
• Views: 1,360
02-01-2015, 01:59 PM
20. ### Simple probablility question. Been years since I have studied this stuff.

I am writing a script that is sort of like a slot machine. Here is how it works random numbers are chosen that are between 0-9 This is done 4...

• Replies: 1
• Views: 1,240
02-01-2015, 09:34 AM
21. ### MGF, Moment-Generating Function

Let X1 and X2 be two independent random variables. Let X1 and Y = X1 + X2 be χ2(r1) (Chi Square) and χ2(r), respectively, where r1 < r. (a) Find...

• Replies: 4
• Views: 1,547
BGM
01-31-2015, 04:58 PM
22. ### Acceptance Testing - Calculating Type 1 and Type 2 Errors

Removed...

• Replies: 1
• Views: 1,637
01-27-2015, 11:25 AM
23. ### When are you using: Bayes or discriteet or norminal

WHEN ARE YOU USING: BAYES OR DISCRITEET (BIO) OR NORMINAL (CONTINU) PROPABILITY? THE FORMULES ARE WRITTEN IN MY TEXTBOOK and i understand the...

• Replies: 0
• Views: 1,615
01-25-2015, 06:55 PM
24. ### Conditional probability of an event given two independent events

I am dealing with an interesting probability problem. I had 16 subjects randomly divided into 4 different rooms, each room having 4 seats. The...

• Replies: 2
• Views: 2,009
01-20-2015, 08:14 AM
25. ### Multiple Events and Cumulative Probability Calculation(s)

Hi! I don't know statistics, hopefully someone will kindly help me. I'd like to learn how to calculate the probability of an event happening Y...

• Replies: 1
• Views: 2,451
01-13-2015, 03:22 PM
26. ### Probability in online casino slot machines: Dilemma

Hi there, I am new here, but I have come as I am interested to see what people make of this. I am part of an online community that collectively...

• Replies: 3
• Views: 2,142
01-13-2015, 03:07 PM
27. ### [ASK] Doctrine of Chances by Abraham de Moivre

Doctrine of Chance is a book published by Abraham de Moivre in 1718. It was on the sbuject of probability containing many innovations such as method...

• Replies: 0
• Views: 1,773
01-09-2015, 10:29 PM
28. ### Standard deviation

Hello To solve the exercise below, I need the standard deviation =σ I have no clue to get it out of the values below: A researcher wants to know...

• Replies: 3
• Views: 3,124
01-09-2015, 01:38 PM
29. ### Request for help in probability question.

There are 50,000 applicants out of which, 20,000 applicants needs to be picked. 1. What is the probability that an applicant say "Joel" is...

• Replies: 0
• Views: 1,275
01-08-2015, 04:08 PM
30. ### Request for help on probability.

Hi All, I need your help to solve this question. I am preparing for exam and trying to solve this question. A ball is selected from a box...

• Replies: 1
• Views: 1,084
01-07-2015, 03:47 PM
31. ### Reversing the moment generating function

So this is my moment generating function \frac{e^{-2t}+e^{-t}+e^{t}+e^{2t}}{4} Now i need to find the PDF or CDF So i think the moment...

• Replies: 1
• Views: 1,347
BGM
01-06-2015, 05:24 PM
32. ### Computing MLE estimate

So I have so i'm stuck at taking the log :mad: can somoene help me ?

• Replies: 5
• Views: 2,264
01-06-2015, 01:17 PM
33. ### Conditional normal implying independence

So reading a book someone comment that e \lvert x \sim N(0,1) hence e is independent of x. Why is this the case? Trying to prove this to myself...

• Replies: 1
• Views: 1,809
BGM
01-06-2015, 05:19 AM
34. ### Expected value and variance of profit

Hello all, I have this question, which I think I partially knows how to solve, but need some completion. "A man is playing versus a machine in the...

• Replies: 1
• Views: 2,766
BGM
01-06-2015, 04:53 AM
35. ### P-value from test statistic

I'm given a test-statistic of 2.4 in one of those H0 type problem with a 0.05 significance level. In the z-table, if you look up 2.4, it says 0.0082....

• Replies: 8
• Views: 35,703
01-01-2015, 10:33 PM
36. ### An engineer has observed that the gap times between...

I am struggling with this question ..please help An engineer has observed that the gap times between vehicles passing a certain point on a...

• Replies: 2
• Views: 2,741
12-31-2014, 04:23 PM
37. ### precision of two independent classifiers

Consider two classifiers A and B giving binary labels to a big set of candidates, say, we have a million cats and a million dogs for labeling. Assume...

• Replies: 0
• Views: 1,263
12-29-2014, 10:12 AM

First off, let me say I know very little about math and even less about probabilities. I am a father of two teenage boys. One of them gave me a...

• Replies: 11
• Views: 2,266
12-23-2014, 05:42 PM
39. ### Group Probability Problem

Hi, I'm having a difficult time figuring out an approach to a problem and could use some help -- if I have a team of 5 basketball players, each...

• Replies: 3
• Views: 1,639
12-19-2014, 01:31 PM
40. ### Interpreting negative binomial regression with log transformed independent variables

My independent variables were highly skewed, so to normalise the distribution they were log transformed. Also since there were zeros in the data,...

• Replies: 0
• Views: 2,268
12-19-2014, 01:12 PM
41. ### Confidence Intervals

Hi I am new to stats and really spending lots of time on concepts which I can build on, I thought I was fairly comfortable with confidence...

• Replies: 5
• Views: 2,676
12-19-2014, 03:12 AM
42. ### I can't undertand two problem..

Hello everyone, I can't solve 2 problem during 4 hours.... Suppose that a tray of eggs consists 10 egg and there are 10 trays(i.e. there is 100...

• Replies: 3
• Views: 1,995
BGM
12-15-2014, 11:40 AM
43. ### confidence levels on 2d \chi^2 grid, where the minimum \chi^2 is not near 1.

Hallo everybody! I have the following problem: I obtained a 2D grid of reduced \Chi^2 fits, where the the minimum \Chi^2 is far from unit (1)....

• Replies: 0
• Views: 2,238
12-12-2014, 04:38 AM
44. ### Probability problem

An experiment consists of flipping one coin four times. Give a pair of events that are independent and a pair of events that that are dependent, and...

• Replies: 0
• Views: 1,300
12-11-2014, 03:12 AM
45. ### Distribution of a function of random variables problem

First off, I'm new to this forum and Probability and Statistics. I'm a junior in college and currently taking my first course in this subject and...

• Replies: 1
• Views: 1,732
12-10-2014, 11:19 PM
46. ### Equal chance of random selection when halves of set are balanced?

Design: For 18 trials numbers (either 0 or 1) are randomly selected, a random portion of the first 9 are 0 and the last 9 are set as the opposite...

• Replies: 0
• Views: 1,246
12-10-2014, 02:34 PM
47. ### Question: Determining percentage of probability

Hello, I'm in the middle of working on an assignment that involves determining probability. I wanted to see if I am on the right track. Any help...

• Replies: 1
• Views: 1,296
BGM
12-09-2014, 01:34 AM
48. ### probability function of sum of multiple normal distributions

I have four normally distributed random variables which may/may not be correlated. I want to find the probability distribution function of the...

• Replies: 4
• Views: 1,624
12-08-2014, 02:50 PM
49. ### Central Limit Theorem

If X is a Gamma(n,1). For which values of n we have P(|\frac{X}{n}-1|>0.01)<0.1 If n=n_0 is the first value of n that satisfies the above equation,...

• Replies: 3
• Views: 1,847
12-08-2014, 06:25 AM
50. ### Convergence in Distribution

If X_n is a sequence of random variables independent and X_n is Binomial(n,p) with 0<p<1 and either T_n=\frac{X_n}{n} for all n 1) Show that...

• Replies: 3
• Views: 1,199
12-07-2014, 11:08 AM
51. ### Markov Inequality

If X_1,X_2,X_3...X_{20} are independent random variables with common distribution Poisson(1). Find with markov inequality a upper limit for...

• Replies: 6
• Views: 1,515
12-06-2014, 04:58 PM
52. ### Binomial Test in Excel

What is the probability of getting AT LEAST 79 out of 90 correct on a True or False test if you are guessing on every question? I think I need to...

• Replies: 0
• Views: 2,489
12-06-2014, 04:46 PM
53. ### Convergence

If Z_n = \frac{1}{n}*\sum_{i=1}^nX_i^2 where X_i=N(\mu,\sigma^2) 1) Show that Z_n \rightarrow^p \mu^2+\sigma^2(convergence in probability) I...

• Replies: 12
• Views: 2,288
12-06-2014, 10:46 AM

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